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Christie LA, Russell TA, Xu J, Wood L, Shepherd GM, Contractor A.Christie LA, et al. Among authors: shepherd gm.Proc Natl Acad Sci U S A. 2010 May 18;107(20):9412-7. doi: 10.1073/pnas.0908206107. Epub 2010 May 3.Proc Natl Acad Sci U S A. 2010.PMID: 20439731Free PMC article.